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The kinds of viruses that we get when we have colds are very good at infecting the respiratory system.
我们感冒时感染的各种感冒病毒,就非常精于感染呼吸系统
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So, they don't start killing all the cells in your respiratory system; they only kill the cells that are harboring the virus.
所以它们不会杀死所有呼吸系统内的细胞,只杀死那些被病毒感染的细胞
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In fact, a real powerful virus would skip the respiratory system altogether, even better than a cold virus.
事实上，真正强有力的病毒,会跳过呼吸系统，比感冒病毒好的多。
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That you put together diseases of the heart, cancer, stroke, and then chronic respiratory diseases, those first top four are accounting for a huge number of deaths.
心脏病,癌症,中风,和慢性呼吸道疾病,这四大疾病加起来造成了大量死亡
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You've got the flu, you've got influenza in your upper respiratory tract, your cells are making more influenza.
你就此得了流感,你得了上呼吸道流感,你的细胞正在制造更多流感病毒
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The respiratory system plays an important role in maintaining our internal environment at the proper level of oxygen, by bringing the right amount in.
呼吸系统的重要性在于,通过向体内输入适量的氧气,维持人体内环境中的氧平衡
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The respiratory system, for example, the renal system, the digestive system, these are examples - three examples of organ systems that contact the external environment.
例如,呼吸系统,泌尿系统,消化系统,这些系统,这三个系统,与外环境相联系
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You breathe it in, it infects the cells of your respiratory tract, and the virus begins to reproduce, and then it spreads throughout your body.
你将之吸入,病原体感染了呼吸道细胞,病毒开始繁殖,接着传遍你的全身
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Now in some--in the chronic respiratory diseases there's some infection but most of the other things are caused by lifestyle or by other factors, not the infectious diseases.
如今一些,如慢性呼吸道疾病,有一些是传染所得,但大多数,都是生活方式或其他因素导致的,而不是感染性疾病
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Adenoviruses are viruses that give upper respiratory infections, they cause colds.
腺病毒可以感染上呼吸道,引起感冒
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That virus is reproducing inside cells of your respiratory tract.
病毒在你的呼吸道细胞内繁殖
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The main goal of the respiratory system is to bring fresh in so that you can extract oxygen from it, and blow used air out so that you can rid of carbon dioxide which is the end product of carbon metabolism inside our bodies.
呼吸系统的主要功能是,吸入新鲜空气,以便获得空气中的氧气,呼出废气,以便排出二氧化碳,二氧化碳是人体内碳代谢的终产物
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